Leptogenesis with SU(5)-inspired mass matrices

In the baryogenesis via leptogenesis framework the baryonic asymmetry depen ds on lepton mass matrices. In a previous paper we used SO(10)-inspired mas s matrices and we found few possibilities to obtain a sufficient level of a symmetry. In the present Letter we use SU(5)-inspired mass matrices, which also allow to check the dependence of the baryonic asymmetry on Dirac neutr ino masses. In particular, we find that the large mixing matter solution to the solar neutrino problem, which within SO(10) gives too small asymmetry, can now be favoured. (C) 2001 Published by Elsevier Science B.V.